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Deembedding and reflection coefficient - RF Cafe Forums
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RF-Ban Post subject: Deembedding and reflection coefficient Posted:
Wed Jan 11, 2006 10:51 am
Captain
Joined: Sat Feb 26,
2005 5:24 pm Posts: 16 Location: Lille, FRANCE Hello, I
am trying to deembed measurements from TDR and i don't see why i can't
get the results i want. I explain my problem: I have measured
through a VNA the reflection coefficients of 3 standards (S0L), and
3 other components. I made a TDR measurement of those components and
standards. From the TDR of the standardsi apply a fft and thanks
to the current and voltage i get the measured reflection coefficient
of each: a=(V+ZI)/sqrt(Real(Z)); b=(V-ZI)/sqrt(Real(Z)); S11m=b/a;
Knowing their true reflection coefficients thanks to the VNA, i compute
the error vectors: b=e11; c=e22; a=e21-e11*e22;
The
problem is that when i use those vectors with TDR of the standards i
find back the good s-parameters of the standards, but when i do this
with other components i don't find at all. with : S11a=(S11m-b)/(a+c.*S11m);
Note : the time span and step, and frequency span and step permits
to work one with each other. Can someone help me ? Thank you
Posted 11/12/2012
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